bazelio, thanks for the video, the speakers over my computer sounded like all box speakers to me. Some people do not like electrostatics but once I listened to them I could not go to a box speaker ever again. Now this is my opinion only but all box speakers to me sound like a megaphone and I hear the enclosure the cones are in, that sonic signature that overwhelms me that something is wrong and it sounds so unnatural to me but once again that it is just my opinion.
Well we're getting off topic as the idea wasn't to evaluate the speakers themselves, but to get a feel for the musical flow and tone in the video.
That aside, only a closed box can produce that perfect PRaT and recreate dynamics extremely well, IME. For me, planar ribbons / estats are better suited to tweeters only, and even there, they just lack attack. Of course a caveat with enclosures is that they do need to be large enough and well-designed. Ahhh, tradeoffs.